socket简单实例

// 服务器#include <stdio.h>#include <winsock2.h>#pragma comment (lib, "ws2_32.lib")  //加载 ws2_32.dllint main() {    //初始化 DLL    WSADATA wsaData;    WSAStartup(MAKEWORD(2, 2), &wsaData);    //创建套接字    SOCKET servSock = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);    //绑定套接字    sockaddr_in sockAddr;    memset(&sockAddr, 0, sizeof(sockAddr));  //每个字节都用0填充    sockAddr.sin_family = PF_INET;  //使用IPv4地址    sockAddr.sin_addr.s_addr = inet_addr("127.0.0.1");  //具体的IP地址    sockAddr.sin_port = htons(1234);  //端口    bind(servSock, (SOCKADDR*)&sockAddr, sizeof(SOCKADDR));    //进入监听状态    listen(servSock, 20);    //接收客户端请求    SOCKADDR clntAddr;    int nSize = sizeof(SOCKADDR);    SOCKET clntSock = accept(servSock, (SOCKADDR*)&clntAddr, &nSize);    //向客户端发送数据    char *str = "Hello World!";    send(clntSock, str, strlen(str) + sizeof(char), NULL);    //关闭套接字    closesocket(clntSock);    closesocket(servSock);    //终止 DLL 的使用    WSACleanup();    return 0;}//客户端#include <stdio.h>#include <stdlib.h>#include <WinSock2.h>#pragma comment(lib, "ws2_32.lib")  //加载 ws2_32.dllint main() {    //初始化DLL    WSADATA wsaData;    WSAStartup(MAKEWORD(2, 2), &wsaData);    //创建套接字    SOCKET sock = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);    //向服务器发起请求    sockaddr_in sockAddr;    memset(&sockAddr, 0, sizeof(sockAddr));  //每个字节都用0填充    sockAddr.sin_family = PF_INET;    sockAddr.sin_addr.s_addr = inet_addr("127.0.0.1");    sockAddr.sin_port = htons(1234);    connect(sock, (SOCKADDR*)&sockAddr, sizeof(SOCKADDR));    //接收服务器传回的数据    char szBuffer[MAXBYTE] = { 0 };    recv(sock, szBuffer, MAXBYTE, NULL);    //输出接收到的数据    printf("Message form server: %s\n", szBuffer);    //关闭套接字    closesocket(sock);    //终止使用 DLL    WSACleanup();    system("pause");    return 0;}